Base for log-loaders.



PATENTED MAY 29, 1906.

J. R. MCGIFFERT. BASE FOR LOG LOADERS.

APPLIOATION FILED 1320.30.1904.

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UNITED STATES PATENT OEEIOE.

JOHN a. McoiEEEEn-OEDULUTE, MTNNESOTAQASSTSNOE TOCLYDE TRON WORKS, or -DULUTH, MINNESOTA, A CORPORATION orV MTN- NESOTA.

BASE Fon LoG-LoADERs.

Specification of Letters Patent.

Patented May 29,1906.

Application filed December 30, 1904. Serial. No..238.983.

class of log-loading devices in which the loading mechanism is mounted upon a basek which is adapted to be mounted upon an ordinary flat or logging car and hauled from car to car, as .may be desired, such hauling movement sometimes involving the necessity of moving the base laterally as well as longitudinally-as, for instance, when the cars are standing upon a curve.

The obj ect of my invention is to effect such sliding movement with the expenditure of less power than it has heretofore, in so far as I am aware, required andalso incidentally to reduce the wear and tear upon the cars over which the mechanism is transported.

My said invention consists of means hereinafter fully described, and particularly set forth in the claims.

The annexed drawings and the following description set forth in detail certain means embodying my invention, s uch means constituting but one of the various forms in whizh the principle of the invention may be use In said annexed drawings, Figure l represents a plan of a base for supporting log-loading mechanism and embodying my invention, portions of the base being shown broken away to disclose the detailed construction. Fig. 2 represents a vertical central longitudinal section of said base. Fig. 3 represents, upon an enlarged scale, a vertical transverse section taken upon the plane indicated by line 3 3, Fig. 1. Fig. 4 represents a detail section of a part of one of the rollers forming part of the structure embodying my invention, together with a sectional view of one of the bearings for the ends of the roller-spindles, such bearing being shown secured to the frame structure of the base.

The said base consists, primarily, of a vframe structure and a series Iof traction-rollers mounted thereon, as hereinafter fully described. The frame'structur'eA includes two pairs of longitudinal arallel beams," each such pair consisting of an outside main 'I- beam a, preferably provided with uptur'ned ends, as shown, and an inner parallel I'beam a of less depth than beam a. Transverse end cross beams a2 are secured to beams a so as to bring their upper surfaces flush with the upper surfaces of said beams' a, asV shown.

These beams rest upon the ends of. beams a, the lower surfaces of the latter' being preferably flush with the lower surfaces of beams a.

Spaced equidistantly along andv riveted toA the inner Opposing surfaces of the beams a and a is a series of bearing members b, in which are mounted the endsof'horizontal spindles b', upon each of which is mounted a roller b2. The axes of the set of rollers supported between the one pair of beams a and 'a' are inclined relatively to the axes of the :rollers supported between the other pair of beams, as shown, and the rollers of the re- Spective sets are parallel with each other. It

will therefore be seen that the axes of one set Yof rollers are inclined in one direction relatively to a central longitudinal plane perpendicular to the plane ofthe base, and the axes of the other set are inclined relatively to said plane in the opposite direction. The rollers are of a diameter such as to cause them to project below the plane of the lower surface of the frame structure, as shown in Figs. 2 and 3, so that when the base is placed upon the top of a fiat or logging car the frame structure will rest upon the rollers and off such car. Suitable cross-braces a3 a3 are provided for properly strengthening the structure.

As a result of the above-described construction the base may be hauled longitudinally, laterally, or diagonally, and in each case a partial rolling contact is effected which reduces the amount of power required for such hauling as compared with the amount required when pure frictional contact is overcome, as in the case in structures heretofore employed, where side runners are used which rest directly upon the car.

The logging-cars now in general use are not provided with a continuous flooring, but are constructed with a skeleton bed consisting of parallel spaced transverse beams or bunks, as

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shown in flowed 'lines n Figs. 1 and 2. To.

provide against the possibility of the rollers eing caught between the bunks, they are so spaced that the longitudinal distance between the rearmost and foremost point of' each roller is greater than the greatest distance between two adjacent bunks, so that the one end of each roller always asses to and upon a bunk before it leaves t e one in the rear thereof, as will be readilyunderstood.

' combination with a frame, of a plurality of rollers mounted thereonl and having their axes inclined relatively to the median of said frame.

2. In a base for log-loading machines,v the combination with a frame structure, of a plurality of rollers mounted thereon having their axes obliquely inclined relatively to the median of said structure and parallel with each other. l

3. In a base for log-loading machines, the combination with a frame, of two sets of rollers mounted thereon, the axes of the rollers of one set being inclined relatively to the axes of the rollers of the other set.

4. In a base for lo -loading machines, the combination lwith a ame structure, of two saam@ setsv of rollers mounted upon opposite sides of a given plane, one set of such rollers having its axes inclined in one direction relatively to said plane, and the other set Vhaving its axes inclined in the opposite direction, relatively thereto.

V5. In a base for log-loading machines, the combination' with/a frame structure including two pairs of arallel longitudinal frame members and rol ers mounted between and having their axes inclined relatively to the members of each pair of such frame members. v

6. In a base for log-loading machines, the combination with a frame structure comprising two pairs of parallel beams andv transverse connecting members therefor, of two sets of rollers mounted between the members of each pair of beams and having their axes inclined relatively thereto7 the axes of the one set of rollers being inclined relatively tothe axes of the other set.

7. In a base for log-loading machines, the combination with a frame structure comprising two side beams, two beams parallel with and included between said side beams, crossbraces joining said two beams, and rollers mounted between said side beams and adj acent parallel beams respectively, said rollers projecting below the lower surfaces of said side and parallel beams.

' Signed by me this 16th day of December,

1904. JOI-IN R. MCGIFFERT. Attest:

N. M. NELSON, C. A. LUsTER. 

